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INSTALLATION
Actual Centerpoint
Chimney
Centerline
Figure 10 -
Locate centerline of chimney
OFFSET INSTALLATION
In order to clear an obstruction, it may be necessary to
offset chimney from vertical. This is accomplished by
using MHSC elbows. Use the 30° Offset Elbow table on
Page 6 to determine proper offset and parts required.
Each offset requires two (2) elbows. The second elbow
is equipped with support straps. It is very important to
install the second elbow in each offset as close to the
FP2342
ceiling or support as possible so that the elbow straps
locate centerline
can be secured to framing members to help support the
weight of the chimney.
Determine offset distance of your chimney arrangement
from centerline of fireplace to centerline of chimney
where it is to pass through ceiling.
Locate center point of the chimney on ceiling as though
a straight up chimney arrangement is to be used. Mea-
sure your offset dimension from the chimney center point
on the ceiling.
87D0176
20 "
(521 mm)
Side of
Fireplace
Plumb Line
Plumb Bob
Imaginary
Centerpoint
FP2342
B36LA8 & B36RA8 Woodburning Fireplaces
CEILING CHIMNEY HOLE/POSSIBLE OB-
STRUCTIONS
The size of the hole in ceiling will vary with the angle at
which the chimney passes through ceiling.
Drive a nail up through ceiling at marked chimney center
point. Go to floor above and see where hole will be cut.
Check to see where existing ceiling joists and other
possible obstructions are located...i.e. wiring, plumbing
etc... If necessary, re-position chimney and/or fireplace
to avoid obstructions.
CUTTING THE HOLE
Cover fireplace collar opening and cut proper sized
chimney hole in chimney. The SK8 pipe allows you to
run pipe through a typical 16" on center joist without cut-
ting joists.
FRAMING THE CEILING HOLE
Frame the ceiling chimney hole as shown in Figure 12.
It is good practice to use framing lumber that is the same
size as the ceiling joists; this is a requirement at attic
level.
The following table gives firestop spacer model num-
bers:
Angle of Chimney at Ceiling
Size of Chimney
8" Flue
"SK" Series
14Z\x" x 14Z\x"
(368 x 368 mm)
The inside dimension of the frame must be the same
as the hole size selected from Figure 12 in order to
provide the required air space (1Z/x" (38 mm) with SK8
between the outside diameter of the chimney and the
edges of the framed ceiling hole.
Existing
14 "
Ceiling
Joists
New Framing
Members
Figure 12 -
Typical frame for ceiling chimney hole
Vertical
30°
SKFS2A
SKFS6A
14Z\x" x 25Z\x"
(368 x 648 mm)
14 "
Chimney
Hole
FP551A
FP551A
BR/BC
19
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